Drier.



. PATENTED MAY 26, 1908. P. W. HOLS'IEIN. DRIER APPLICATION FILED AUG.23,1906.

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Arm 889,009. PATENTED MAY 26, 1908. P. w. HOLSTEIN.

DRIER.

APPLICATION FILED MUG. 23,1906.

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UNITED STATES PATENT oEEroE.

PAUL W. HOLSTEIN, OF COLUMBUS, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TOTHE JEFFREY MANUFACTURING COMPANY, A CORPORATION OF OHIO.

DRIER.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed August 23, 1966. Serial No. 331,798.

To all whom it may concern:

Be it known that I, PAUL W. HoLsTEIN, a citizen of the United States,residing at C0- lumbus, in the county of Franklin and State of Ohio,have invented certain new and useful Improvements in Driers, of whichthe following is a specification, reference being had therein to theaccompanying drawing.

My invention relates to steam driers, and its object is to provide adrier in which a current of heated air is brought into direct contactwith the material to be dried, the material being meanwhile constantlyagitated; and to maintain a high temperature in the drying chamber, andto facilitate the discharge of the condensed steam.

In rotary steam driers of the inclineddrum type heretofore used, asingle dryingcoil secured to the inside of the drum-shell and rotatingtherewith has been found disadvantageous for the reason that the extremelength of the coil condenses the steam supplied to it more rapidly thanthe water of condensation can be effectively discharged from the coil.This difficulty is obviated by the improvement hereinafter described andshown in the accompanying drawings, in which Figure 1 is a longitudinalview, artly in elevation and partly in section, 0 my imroved drier. Fig.2 is a section on the line l III of Fig. 1, looking in the direction ofthe arrow a. Figs. 3 and 4 are details of the checlcflange for thehead-plate of the drum; and Fig. 5 is a detail showing one form of clampfor securing the coils to the interior of the drum. Fig. 6 is a partialend View of the upper end of the drum showing the arrangement of exhaustducts and exhaust fan.

1 is the rotary, inclined drum mounted in suitably supported bearings 2,2, and driven by a gear-train 3, 3, of any desired character. The drumsupports comprise spiders 4,- 4, having hollow trunnions, through theaxial openings 5, 5 of which trunnions the heating means can be suppliedwith steam from a main 6, by means of a swivel connection 7. A similardischarge swivel 7 at the opposite end, serves as an outlet for thewater of condensation.

Into the inner ends of each of the trunnions is screwed a manifold 8,shown in the drawings as having four lateral openings; though it will beunderstood that any desired number of'laterals may be used. To each ofthe laterals of the supply manifold is connected a radial pipe 9,preferably provided with a union 10, for convenience in making up. Eachradial branch 9 supplies an independent heater-coil 11, made up oflongitudinal pipes and returns, as shown, and provided at the oppositeend of the drum with a radial outlet 12, connected to the dischargemanifold. The coils 11 are secured to the interior of the drum 1 byclips 13 and bolts 14 in the manner shown in Fig. 5.

The drum is also provided with lifting blades 15, for raising thematerial to be dried, as the drum rotates.

Surrounding the drum is a casing 16, preferably of wood, and providednear its for- Ward end with a plurality of air-inlets 17, each of whichmay be closed by a pivoted cover 18. This casing is closed rearwardly bya plate 19, of any suitable material, and at its forward end by anapertured plate 21, to which is attached the check-flange 22, shown indetail in Figs. 3 and 4. A ring 23, preferably of angle iron, isattached to the interior of the drum 1 and makes a practically air-tightjoint between the moving drum and the stationary casing, as will bereadily understood from Fig. 1.

Secured to the forward end of the casing is a feed-hopper and chute 20,which serves to introduce the material into the drum just above theforward trunnion.

Two exhaust hoods 24 also project through the plate 21, one hood beinglocated on each side of the forward trunnion and connected by a conduit25 to the transversely arranged intake of an exhaust-fan 26, as will bereadily understood.

The material, after having passed the length of the drum and having beendried in transit, is received by a hopper or chute 27, provided with adrop door 28.

The operation is as follows: The material received at the forward, upperend of the drum is raised and let fall by the blades 15 constantly movedover the coils 11 and dropped across the drum; meanwhile being slow yfed toward the exit end of the drum. At the same time, air entering at17, passes backward in contact with the outside of the shell 1, isheated thereby, then enters between the plate 19 and the end of thedrum,passing thence through the length of the drum and in direct contact withthe falling material, and is finally drawn off by the fan made of anylength and number to most efficiently heat the air and material, andmost readily discharge water from the coils without clogging the same.

Many changes can be made in the apparatus without departing from myinvention; since WVhat I claim is 1. In a drier, a rotatable drum, aplurality of heating-coil sections constituting a cagelike structureconcentric with said drum and secured interiorly to the peripherythereof,

means for supplying steam to and means for draining water from each ofsaid sections while in motion.

2. In a drier, a rotary drum, hollow trunnions therefor, swiveled fluidconnection at the exterior ends of said trunnions, a manifold at theinterior ends thereof and a plurality of independent coil-sectionsconstituting a cage-like structure, each of said coil-sections beingsuitably interiorly secured to the periphery of said drum and connectingsaid manifolds.

3. In a drier, a rotary drum mounted on hollow trunnions, swiveled fluidconnections at the exterior ends of said trunnions, and a plurality ofindependent, segmental coilsections connecting the interior ends of saidtrunnion openings, said sections constituting a heating surfaceconcentric with said drum.

4:. In a drier, an inclined, rotary drum mounted on hollow trimnions,outer fluid mounted on hollow trunnions, outer fluid connections forsaid trunnions located at opposite ends of said drum, manifolds atopposite ends of said drum and connected to the inner ends of saidtrunnions, and a plurality of independent coil-sections constitutingwith said manifolds a cage-like structure each of said coil-sectionsbeing suitably secured to the periphery of said drum, the opposite endsof each of said coils being connected to said manifolds.

6. In a drier, a rotary drum, a plurality of heating pipes adjacent theperiphery of said drum and constituting a cage-like structure concentricwith said drum and lifting blades inclined outwardly and in direction ofrotation each of which is secured to the interior of the periphery ofthe drum and is arranged to lie in a plane approximately tangential toone of said heating pipes.

In testimony whereof I ai fix my signature, in presence of twowitnesses.

PAUL W. IIOLSTEIN.

Witnesses:

H. S. RANSOM, S. J. WHITE.

